Podcast
Questions and Answers
Which of the following properties is NOT typically associated with metals?
Which of the following properties is NOT typically associated with metals?
- They have a metallic luster and shine when polished.
- They are generally brittle and easily break. (correct)
- They are good conductors of heat and electricity.
- They are malleable and can be easily shaped.
What happens to metallic properties as we move from left to right across a period in the periodic table?
What happens to metallic properties as we move from left to right across a period in the periodic table?
- They remain unchanged.
- They become weaker. (correct)
- They alternate between strong and weak.
- They become stronger.
Which of the following elements is the most active metal among the first 20 elements in the periodic table?
Which of the following elements is the most active metal among the first 20 elements in the periodic table?
- Carbon
- Oxygen
- Fluorine
- Potassium (correct)
Which of the following is a characteristic of non-metals at ordinary temperatures?
Which of the following is a characteristic of non-metals at ordinary temperatures?
Based on the information provided, which of the following objects would most likely be made of a non-metal?
Based on the information provided, which of the following objects would most likely be made of a non-metal?
Which of the following statements best describes the relationship between the activity of a metal and its position in the periodic table?
Which of the following statements best describes the relationship between the activity of a metal and its position in the periodic table?
What makes mercury unique among metals?
What makes mercury unique among metals?
In the experiment described in the text, how can you determine if an object is a good conductor of electricity?
In the experiment described in the text, how can you determine if an object is a good conductor of electricity?
Flashcards
Properties of Metals
Properties of Metals
Metals are solid, shiny, malleable, and conduct heat and electricity.
Properties of Non-Metals
Properties of Non-Metals
Non-metals are often gaseous, soft, crumbly, and poor conductors of heat and electricity.
Conductivity in Metals
Conductivity in Metals
Metals conduct electricity well, shown by glowing bulbs in circuits.
Conductivity in Non-Metals
Conductivity in Non-Metals
Non-metals do not conduct electricity; the bulb won't light up.
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Activity to Identify Materials
Activity to Identify Materials
Test objects to determine if they are metal or non-metal based on properties.
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Most Active Metal
Most Active Metal
Potassium is the most active metal among the first 20 elements.
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Least Active Non-Metal
Least Active Non-Metal
Fluorine is the least active among non-metals and the most active non-metal overall.
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Mercury's Uniqueness
Mercury's Uniqueness
Mercury is a metal that is liquid at room temperature, unlike other solid metals.
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Comparing Metals and Non-Metals
- Metals:
- Usually solid at room temperature
- Shiny on surfaces
- Don't break easily when dropped
- Good conductors of heat and electricity
- Malleable (easily shaped)
- Produce a sound when struck
- Properties increase going down a group, decrease going across a period
- Potassium is the most reactive metal among the first 20 elements
- Non-Metals:
- Mostly gases at room temperature
- Soft
- Often crumbly
- Poor conductors of heat and electricity
- Non-metallic properties increase going across a period, decrease going down a group.
- Fluorine is the least reactive non-metal among the first 20 elements and is among the most reactive nonmetals overall
Identifying Metals and Non-Metals
- Properties to observe:
- Visual: Appearance (shiny, dull, opaque, translucent), shape (malleable, crumbly), texture, crystal structure
- Electrical Conductivity: Use a circuit with a bulb to see if the object allows electricity to flow
- Heat Conductivity: Feel if the object feels warm/cold to the touch
- Sound: Striking the object to hear if it makes a sound
Distinguishing Metal from Non-Metal
- Using a combination of properties is more reliable than using one property alone
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